Otero County, NM's soil, for a septic absorption field

Very limited

In Otero County, NM, 56.4% of the surveyed land carries a "Very limited" rating for a standard septic drain field. Practically, that rules out a simple gravity system for most of the county - 56.4% of it sits in USDA's most-constrained bucket. Otero County, NM is 6,612.562 square miles with a population of 69,711.

What Otero County's reading doesn't cover

This is a countywide, area-weighted figure across every soil survey map unit in Otero County, NM - never a reading for one specific parcel. A local percolation test, typically $750-$1,850 (around $1,300 typical), is the only way to know what one lot in Otero County will actually do.

What a system would cost here

With 56.4% of Otero County rating "Very limited", a standard gravity system is not a safe assumption here. The engineered-system range, $10,000-$40,000 (mound or aerobic treatment), is the more realistic number to plan around, against $3,000-$8,000 for a conventional system on the rare lot that passes.

Where this sits nationally

Nationally, Otero County, NM is the 2,795-most-constrained of 3,058 rated counties for septic soil. Within New Mexico alone it ranks 24 of 29.

Before you act on this

How this rating is built, and its real limits · Conventional vs. engineered septic systems